The MX250 microprocessor control system, includes as standard many of the most common features that are options on competing transfer switches. It also provides an intuitive user interface, communications capability and self diagnostics.

The transfer switch monitors utility and generator power. When utility power fails or is unsatisfactory, the control starts the generator set and transfers the load to the generator set as soon as the generator reaches speed and voltage. When utility power is restored the transfer switch automatically transfers back to utility power, shutting down the generator and instantly resetting itself for the next power interruption. No action is required by the owner.

We recommend ZTG switches when purchasing any standby or primary power generator systems. If you require optional features such as auxiliary contacts, extra power poles to switch neutral, special enclosures or communications features, we recommend that you purchase this ZTG series. If you require a switch that will handle large motor loads or inductive loads see GE Zenith, ZTS Industrial Automatic Transfer Switches, Service Entrance. For Residential and commercial applications see GE Zenith, ZTX Light Duty Residential & Commercial Transfer Switches. Prices and the most common accessories are online on this website for all models.

• GE Zenith’s ZTG Series Automatic Transfer Switches are designed for emergency and standby applications.
• Standard models in stock, dropped shipped to your location. FREE SHIPPING when purchased with a generator!
• Sizes include 40 to 3,000 amps with 2, 3 or 4 pole configurations.
• Available 120/240 VAC, 120/208 VAC, 277/480 VAC and other voltages up to 600 VAC. See Factory Brochure under Additional Information.
• Switch is true double throw, mechanically interlocked and mechanically held, electrically operated utilizing a reliable, field-proven single solenoid operator.
• Switch mechanism absolutely prohibits connecting both sources together. Cannot be over-ridden.
• Available in ZTG (standard) or ZTGD (delayed transition) models
• Available in Utility to Generator, Utility to Utility and Generator to Generator application configurations.
• Available in NEMA Type 1 (indoor), 3R (outdoor) enclosures and open (back-panel mounted) configurations as well as NEMA 4, 4X & 12.
• Dimensions shown on ZTG Dimensions under Additional Information.
• GE Zenith’s ZTX switches are equipped with the MX150 control panel. This microprocessor control includes:
• Under-voltage sensing (90% pickup, 80% dropout) of Source 1 (normal).
• Voltage and frequency sensing of Source 2 (emergency), (90% voltage, 95% frequency pickup).
• Time Delay Engine Start (P) - 0-10 seconds, factory setting 3 seconds.
• Time Delay Engine Warm-up (W) - Transfer to Emergency (Source 2) - 0 -5 minutes, factory setting 1 second.
• Time Delay Utility Stabilization/Retransfer to Utility (Source 1) (T) - 0-60 minutes, factory setting 30 minutes.
• Time Delay Engine Cool Down (U) - 0-60 minutes, factory setting 5 minutes.
• Generator exerciser timer built-in. 365 day adjustable time setting. Factory set at 7 days. Exercises Source 2 with or without load.
• Switches feature contacts that are easily accessible for easy inspection and preventive maintenance.
• Rated for standby applications and intended for use only in optional (non-critical) standby systems in accordance with the National Electrical Code. NEC/NFPA 70, Article 702.
• Not intended for emergency or life-support systems.
• Qualified and listed to UL 1008, CSA 22.2 and IEC, 480 VAC 50/60 Hz for automatic transfer equipment standards.
• For technical data, dimensions, features, remote controls, monitoring, warranty and other information. See Additional Information below.